* {
    margin: 0;
    padding: 0;
}
.app {
    height: 45px;
    width: 100%;
    color: #fff;
    background-color: #333;
}
.app li {
    float: left;
    line-height: 45px;
    text-align: center;
}
.app ul li:nth-child(1) {
    width: 8%;
}
.app ul li:nth-child(1) img {
    width: 10px;
    height: 10px;
    
}
.app ul li:nth-child(2) {
    width: 10%;
}
.app ul li:nth-child(2) img {
    width: 30px;
    height: 30px;
    vertical-align: middle;
}
.app ul li:nth-child(3) {
    width: 57%;
}
.app ul li:nth-child(4) {
    width: 25%;
    background-color: #F63515;
}
/* search======================= */
.search-warp {
    position: fixed;
    top: 45px;
    width: 100%;
    height: 44px;
    background-color: pink;
}
.button img {
    position: absolute;
    top: 50%;
    transform: translate(0,-50%);

    width: 20px;
    height: 18px;
}
/*<content start=================================-->*/
/*<content start=================================-->*/